Commit 9ed96484 authored by Boaz Harrosh's avatar Boaz Harrosh
Browse files

exofs: Add option to mount by osdname 



If /dev/osd* devices are shuffled because more devices
where added, and/or login order has changed. It is hard to
mount the FS you want.

Add an option to mount by osdname. osdname is any osd-device's
osdname as specified to the mkfs.exofs command when formatting
the osd-devices.
The new mount format is:
	OPT="osdname=$UUID0,pid=$PID,_netdev"
	mount -t exofs -o $OPT $DEV_OSD0 $MOUNTDIR

if "osdname=" is specified in options above $DEV_OSD0 is
ignored and can be empty.

Also while at it: Removed some old unused Opt_* enums.

Signed-off-by: default avatarBoaz Harrosh <bharrosh@panasas.com>
parent 66cd6cad

Documentation/filesystems/exofs.txt

+9 −1
Original line number Diff line number Diff line
@@ -104,7 +104,15 @@ Where: 
    exofs specific options: Options are separated by commas (,)

		pid=<integer> - The partition number to mount/create as

                                container of the filesystem.

                                This option is mandatory.

                                This option is mandatory. integer can be

                                Hex by pre-pending an 0x to the number.

		osdname=<id>  - Mount by a device's osdname.

                                osdname is usually a 36 character uuid of the

                                form "d2683732-c906-4ee1-9dbd-c10c27bb40df".

                                It is one of the device's uuid specified in the

                                mkfs.exofs format command.

                                If this option is specified then the /dev/osdX

                                above can be empty and is ignored.

                to=<integer>  - Timeout in ticks for a single command.

                                default is (60 * HZ) [for debugging only]

fs/exofs/super.c

+27 −4
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ 
 * struct to hold what we get from mount options

 */

struct exofs_mountopt {

	bool is_osdname;

	const char *dev_name;

	uint64_t pid;

	int timeout;
@@ -56,7 +57,7 @@ struct exofs_mountopt { 
/*

 * exofs-specific mount-time options.

 */

enum { Opt_pid, Opt_to, Opt_mkfs, Opt_format, Opt_err };

enum { Opt_name, Opt_pid, Opt_to, Opt_err };



/*

 * Our mount-time options.  These should ideally be 64-bit unsigned, but the
@@ -64,6 +65,7 @@ enum { Opt_pid, Opt_to, Opt_mkfs, Opt_format, Opt_err }; 
 * sufficient for most applications now.

 */

static match_table_t tokens = {

	{Opt_name, "osdname=%s"},

	{Opt_pid, "pid=%u"},

	{Opt_to, "to=%u"},

	{Opt_err, NULL}
@@ -94,6 +96,14 @@ static int parse_options(char *options, struct exofs_mountopt *opts) 


		token = match_token(p, tokens, args);

		switch (token) {

		case Opt_name:

			opts->dev_name = match_strdup(&args[0]);

			if (unlikely(!opts->dev_name)) {

				EXOFS_ERR("Error allocating dev_name");

				return -ENOMEM;

			}

			opts->is_osdname = true;

			break;

		case Opt_pid:

			if (0 == match_strlcpy(str, &args[0], sizeof(str)))

				return -EINVAL;
@@ -575,9 +585,17 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent) 
		goto free_bdi;



	/* use mount options to fill superblock */

	if (opts->is_osdname) {

		struct osd_dev_info odi = {.systemid_len = 0};



		odi.osdname_len = strlen(opts->dev_name);

		odi.osdname = (u8 *)opts->dev_name;

		od = osduld_info_lookup(&odi);

	} else {

		od = osduld_path_lookup(opts->dev_name);

	}

	if (IS_ERR(od)) {

		ret = PTR_ERR(od);

		ret = -EINVAL;

		goto free_sbi;

	}
@@ -670,6 +688,8 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent) 


	_exofs_print_device("Mounting", opts->dev_name, sbi->layout.s_ods[0],

			    sbi->layout.s_pid);

	if (opts->is_osdname)

		kfree(opts->dev_name);

	return 0;



free_sbi:
@@ -678,6 +698,8 @@ free_bdi: 
	EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",

		  opts->dev_name, sbi->layout.s_pid, ret);

	exofs_free_sbi(sbi);

	if (opts->is_osdname)

		kfree(opts->dev_name);

	return ret;

}
@@ -695,6 +717,7 @@ static struct dentry *exofs_mount(struct file_system_type *type, 
	if (ret)

		return ERR_PTR(ret);



	if (!opts.dev_name)

		opts.dev_name = dev_name;

	return mount_nodev(type, flags, &opts, exofs_fill_super);

}

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